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Pig farming is a major contributor to greenhouse gases worldwide, accounting for nearly 10% of annual CO2 emissions. In southern Spain, large pig farms have long been criticised for their environmental impact and the strong odours they produce, prompting some areas to ban the expansion of these macro-farms.

 

Now, scientists in Andalucía have developed a promising treatment for pig slurry that could help reduce nitrogen pollution and make pig farming cleaner.

 

The approach uses natural microbial processes to transform harmful compounds in the waste, lowering its impact on local rivers and ecosystems. By encouraging beneficial bacteria to grow, ammonia in the slurry is converted into less damaging forms, helping to protect the environment and reduce the risk of water contamination.

 

The Andalucían innovation is part of a much broader effort to tackle the environmental challenges of intensive livestock farming.

 

In fact, similar initiatives have been underway in Murcia since the end of last year. Back in December, Asaja Murcia launched a project aimed at reducing pollution in the Mar Menor.

 

Their approach used zeolites, a material that stimulates microbes in manure and slurry. These microbes create bacteria that transform ammonia into ammonium, breaking down the slurry, eliminating odours and keeping flies away.

 

The Murcia treatment is straightforward: a kilo of Biaurelian is sprinkled into the pits where pig excrement collects. For an average farm with around 2,000 pigs, it costs about €150 a month, roughly 40 cents per pig per year, offering a practical and affordable way to reduce pollution, greenhouse gases and unpleasant smells at the same time.

 

Together, the Andalucían and Murcian projects highlight the potential for science to make pig farming cleaner and more sustainable. While the Andalucían method is focused on reducing nitrogen pollution, Murcia’s approach addresses odours, flies and greenhouse gas emissions.

 

But together they demonstrate that even small interventions can make a big difference for the environment and local communities.

 

 

Image: Pixabay